CN112708332A - Weather-resistant high-temperature-resistant powder coating composition - Google Patents
Weather-resistant high-temperature-resistant powder coating composition Download PDFInfo
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- CN112708332A CN112708332A CN202011593729.6A CN202011593729A CN112708332A CN 112708332 A CN112708332 A CN 112708332A CN 202011593729 A CN202011593729 A CN 202011593729A CN 112708332 A CN112708332 A CN 112708332A
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- weather
- temperature
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- coating composition
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
Abstract
The invention discloses a weather-resistant high-temperature-resistant powder coating composition, which at least comprises organic silicon resin, polyester resin and acrylic resin, wherein the acrylic resin can be subjected to crosslinking curing reaction with the polyester resin; according to the invention, through the combined design of specific raw material formulas, the raw material cost is reduced, and simultaneously the weather resistance and the temperature resistance are ensured, so that the composite material is suitable for large-scale production and application.
Description
Technical Field
The invention belongs to the field of powder coating, and particularly relates to a weather-resistant high-temperature-resistant powder coating composition.
Background
The existing high-temperature-resistant powder coating is generally added with a large weight part of organic silicon resin to improve the temperature resistance, so that the formula cost is high, the performances on the film performance and the weather resistance are poor, and the high-temperature-resistant powder coating is not suitable for being used as outdoor powder coating. For example, patent application with publication number CN109161311A discloses a polyester resin for high-adhesion high-temperature-resistant powder coating and a preparation method thereof, and mainly proposes to use a thermosetting polyester resin blended silicone resin with good coating adhesion to improve the temperature resistance and the coating performance, but the coating has poor weather resistance and the polyester resin has poor temperature resistance.
In order to improve the weather resistance of the high-temperature-resistant powder coating, the invention patent application with the publication number of CN108977061A discloses a weather-resistant high-temperature-resistant powder coating, and proposes to adopt acrylic resin with excellent weather resistance mixed with organic silicon resin and isocyanate capable of respectively carrying out crosslinking curing reaction with the organic silicon resin and the acrylic resin so as to simultaneously improve the weather resistance and the temperature resistance. However, the cost of the adopted acrylic resin material is still high, and the mass production application is difficult.
Therefore, the applicant wishes to seek technical solutions to solve the above technical problems.
Disclosure of Invention
In view of the above, the present invention provides a weather-resistant and high-temperature-resistant powder coating composition, which is designed by combining specific raw material formulas, reduces raw material cost, ensures weather resistance and temperature resistance, and is suitable for large-scale production and application.
The technical scheme adopted by the invention is as follows:
a weather-resistant high-temperature-resistant powder coating composition at least comprises a silicone resin, a polyester resin and an acrylic resin, wherein the acrylic resin can perform a crosslinking curing reaction with the polyester resin.
Preferably, the silicone resin comprises a self-crosslinking curable silicone resin and/or a silicone resin which can undergo a crosslinking curing reaction with a curing agent; further preferably, the silicone resin includes a sheet-like silicone resin containing a phenyl group, ensuring good compatibility with both the acrylic resin and the polyester resin.
Preferably, the proportion of the silicone resin in parts by weight of the weather-resistant and high-temperature-resistant powder coating composition ranges from 5 to 35 wt%; more preferably, the silicone resin accounts for 15 to 25 wt% of the weather and high temperature resistant powder coating composition.
Preferably, the polyester resin accounts for 10-40 wt% of the weather and high temperature resistant powder coating composition, and more preferably, the polyester resin accounts for 15-30 wt% of the weather and high temperature resistant powder coating composition.
Preferably, the weight ratio of the acrylic resin to the polyester resin ranges from 1:3 to 3: 1.
Preferably,the weight proportion of acrylic resin and polyester resin is 1:3-3:1.
Preferably, the polyester resin comprises a carboxyl-saturated polyester resin having an acid value in the range of 20 to 40mgKOH/g, more preferably 25 to 36 mgKOH/g; the acid number data detection standard referred to in this application is ISO 3682-1998.
Preferably, the viscosity range of the polyester resin at the temperature of 165 ℃ is 400-800 Pa.s, more preferably 400-600 Pa.s, the viscosity data related to the application is measured by an ICI CONE-PLATE viscometer (CONE & PLATE), and the standard of measurement is ASTM D4287-1994.
Preferably, the glass transition temperature range of the polyester resin is 60-70 ℃, the glass transition temperature data related to the present application is obtained by detection through a METTLER thermal analyzer, the detection method adopts a Differential Scanning Calorimetry DSC (English full name: Differential Scanning Calorimetry), and the heating temperature-rising speed parameter is set at 20 ℃/min.
Preferably, the acrylic resin comprises GMA acrylic resin, referred to herein collectively as Glycidyl Methacrylate, which is a well-known type of acrylic resin.
Preferably, the epoxy equivalent of the GMA acrylic resin is in the range of 400-800g/eq, more preferably 500-700g/eq, and even more preferably 550-650 g/eq; the standard for detecting the epoxy equivalent data related to the application is GB/T4612-2008.
Preferably, the coating further comprises a curing agent, which is used for carrying out crosslinking curing reaction with the polyester resin or the organic silicon resin or the acrylic resin, so that the crosslinking degree is improved, and the adhesion performance of the coating on the substrate can be further improved; particularly preferably, the curing agent may include isocyanate.
Preferably, a curing agent having an epoxy group, more preferably a glycidyl functional curing agent, is included for a crosslinking curing reaction with the polyester resin.
Preferably, the curing agent with epoxy group accounts for 10-25 wt% of the weight of the polyester resin, which can further improve the crosslinking curing degree of the polyester resin and is beneficial to the adhesion performance of the coating film on the substrate.
The invention utilizes the organic silicon resin capable of carrying out crosslinking curing reaction, the polyester resin capable of carrying out crosslinking curing reaction and the acrylic resin as the main raw materials of the powder coating composition, so that the raw material cost is obviously reduced, and on the basis of improving the temperature resistance of the coating film by the organic silicon resin, the applicant surprisingly discovers that the polyester resin and the acrylic resin can ensure that the coating film has good adhesive force, weather resistance and temperature and light retention by carrying out crosslinking curing reaction, and the powder coating composition is suitable for large-scale production and application. The invention also particularly selects the carboxyl saturated polyester resin with low acid value and high viscosity and the weather-resistant acrylic resin (preferably GMA) with epoxy group, which is beneficial to quickly carrying out crosslinking curing reaction and simultaneously improving the adhesive force of the coating on the base material, and can effectively improve the temperature resistance of the polyester resin and ensure the light-retaining property of the coating under the high-temperature condition.
Detailed Description
This example presents a weather-resistant and high-temperature-resistant powder coating composition, the raw materials of which can be prepared with reference to table 1 below:
table 1 table of raw materials of formulations of examples of the present invention
In order to further verify the implementation effect of the present application, the present application performs the development implementation of the following specific examples:
example 1: a weather and high temperature resistant powder coating composition prepared according to the following table 2:
table 2 table of raw materials for formulation of this example 1
The organic silicon resin adopts sheet-shaped silicon resin containing phenyl, and good compatibility with acrylic resin and polyester resin is ensured.
The weather-resistant and high-temperature-resistant powder coating composition is obtained through the conventional known procedures of mixing, melt extrusion (through a screw extruder), tabletting, crushing, grinding and the like, then the weather-resistant and high-temperature-resistant powder coating composition is respectively sprayed on an aluminum plate and an iron plate through an electrostatic spraying process, and curing is completed under the thermosetting condition (200 ℃ @ 220 @15-20 minutes), so that a weather-resistant and high-temperature-resistant cured coating film is formed on the surfaces of the aluminum plate and the iron plate, and the thickness range of the coating film is 60-150 micrometers (the test standard is ISO 2360-.
In this example, a 288 ℃ temperature and gloss retention test was performed on the aluminum plate and the iron plate with the weather-resistant and high temperature-resistant cured coating prepared by the above method, and the test conditions of the temperature and gloss retention test included: the test method is characterized in that the test cycle is that the test method is placed for 1 hour under the temperature condition of 288 ℃ (a muffle furnace is adopted as high-temperature environment equipment), the glossiness (60-degree angle) of the glass is tested according to ISO2813-2014 after every 2 test cycles are finished, the final light-retaining rate is required to be more than or equal to 75% after the glass is placed for 10 test cycles at intervals, and the test results are shown in the following table:
through the 288 ℃ temperature and gloss resistance test, the weather-resistant and high-temperature-resistant cured coating film prepared in the embodiment has excellent temperature and gloss resistance on an iron or aluminum base material.
In this example, the aluminum plate and the iron plate with the weather-resistant and high temperature-resistant cured coating prepared by the above method were subjected to a 288 ℃ color retention test respectively, and the test conditions of the temperature resistance and color retention test included: the method is characterized in that the method is used for placing the film for 1 hour at 288 ℃ (a muffle furnace is adopted as high-temperature environment equipment) for one test cycle, the color difference change of the film is tested by a Datacolor colorimeter after every 2 test cycles are finished, the final color difference value delta E is required to be less than or equal to 4.0 after 10 test cycles are placed at intervals, and the test results are shown in the following table:
through the 288 ℃ temperature and color retention test, the weather-resistant and high-temperature-resistant cured coating film prepared in the embodiment has excellent temperature and color retention on an iron or aluminum base material.
In this embodiment, the 288 ℃ temperature-resistant adhesion test is performed on the aluminum plate and the iron plate with the weather-resistant and high-temperature-resistant cured coating film prepared by the above method, and the test conditions of the temperature-resistant adhesion include: the method is characterized in that the method is carried out under the temperature condition of 288 ℃ (a muffle furnace is adopted as high-temperature environment equipment) for 1 hour for one test cycle, the adhesive force grade of the method is tested according to the test standard ASTM D3359 after every 2 test cycles are finished, the final adhesive force grade is required to be not less than 3B after the method is carried out for 10 test cycles at intervals, and the test results are shown in the following table:
through the 288 ℃ temperature-resistant adhesive force test, the weather-resistant and high-temperature-resistant cured coating film prepared by the embodiment has excellent temperature-resistant adhesive force performance on an iron or aluminum base material.
In this example, the weather-resistant xenon lamp test was also performed on the aluminum plate and the iron plate with the weather-resistant and high temperature-resistant cured coating film prepared by the above method according to the test standard ISO16474-2, and the test results are shown in the following table:
those skilled in the art can develop and implement different embodiments according to the present embodiment and combining with the common general knowledge in the art, and can also obtain the technical effects similar to those of the present embodiment 1.
Comparative example 1: the iron plate of comparative example 1 having a cured coating film was fabricated by the same fabrication method as in example 1 of this application, using a conventional high temperature-resistant powder coating material commercially available.
Comparative example 2: the iron plate of comparative example 2 having a cured coating film was prepared by the same preparation method as in example 1 of the present application using the high temperature resistant powder coating of CN 109161311A.
288 ℃ temperature and gloss retention, 288 ℃ temperature and color retention, 288 ℃ adhesion and weathering resistance were performed according to the test method of example 1, with the following test results:
example 2: the rest of the technical scheme of the embodiment 2 is the same as the embodiment 1, except that the embodiment 2 does not add isocyanate; the initial adhesive force is reduced compared with that of the embodiment 1, but the adhesive force grade is always kept to be more than or equal to 3B in a cycle test; the results of the 288 ℃ temperature and gloss retention test and the 288 ℃ temperature and color retention test are unchanged.
Example 3: the other technical solutions of this example 3 are the same as those of example 1, except that in this example 3, triglycidyl isocyanurate is not added; the initial adhesive force is reduced compared with that of the embodiment 1, but the adhesive force grade is always kept to be more than or equal to 3B in a cycle test; the results of the 288 ℃ temperature and gloss retention test and the 288 ℃ temperature and color retention test are unchanged.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (13)
1. A weather-resistant and high-temperature-resistant powder coating composition is characterized by at least comprising a silicone resin, a polyester resin and an acrylic resin, wherein the acrylic resin can perform a crosslinking curing reaction with the polyester resin.
2. The weather and heat resistant powder coating composition according to claim 1, wherein the silicone resin comprises a self-crosslinkable curable silicone resin and/or a silicone resin which can undergo a crosslinking curing reaction with a curing agent.
3. The weather-resistant and high-temperature-resistant powder coating composition as claimed in claim 1, wherein the silicone resin is present in an amount ranging from 5 to 35 wt% based on the weight of the weather-resistant and high-temperature-resistant powder coating composition.
4. The weather-resistant and high-temperature-resistant powder coating composition as claimed in claim 1, wherein the polyester resin is present in an amount ranging from 10 to 40 wt% based on the weight of the weather-resistant and high-temperature-resistant powder coating composition.
5. The weather and heat resistant powder coating composition according to claim 1, wherein the weight ratio of the acrylic resin to the polyester resin is in the range of 1:3 to 3: 1.
6. The weather and temperature resistant powder coating composition of claim 1, wherein said polyester resin comprises a carboxyl saturated polyester resin having an acid number in the range of 20 to 40 mgKOH/g.
7. The weather and high temperature resistant powder coating composition as claimed in claim 1, wherein the polyester resin has a viscosity of 400-800 Pa-s at 165 ℃.
8. The weather and temperature resistant powder coating composition of claim 1, wherein the polyester resin has a glass transition temperature in the range of 60-70 ℃.
9. The weather and heat resistant powder coating composition according to claim 1 or 6, wherein the acrylic resin comprises GMA acrylic resin.
10. The weather and high temperature resistant powder coating composition as recited in claim 9, wherein the GMA acrylic resin has an epoxy equivalent weight in the range of 400-800 g/eq.
11. The weather and heat resistant powder coating composition as claimed in claim 1, further comprising a curing agent for cross-linking curing reaction with the polyester resin or the silicone resin or the acrylic resin to increase a degree of cross-linking.
12. The weather and heat resistant powder coating composition as recited in claim 11, including a curing agent having an epoxy group for cross-linking curing reaction with the polyester resin.
13. The weather and temperature resistant powder coating composition according to claim 12, wherein the curing agent having an epoxy group is 10 to 25 wt% based on the weight of the polyester resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011593729.6A CN112708332A (en) | 2020-12-29 | 2020-12-29 | Weather-resistant high-temperature-resistant powder coating composition |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011593729.6A CN112708332A (en) | 2020-12-29 | 2020-12-29 | Weather-resistant high-temperature-resistant powder coating composition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116102949A (en) * | 2022-12-27 | 2023-05-12 | 江苏金土木精工制造有限公司 | High-performance protective paint and paint spraying process thereof |
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